- Parents and teachers are concerned about classroom air quality due to the delta variant surge.
- A DIY air purifier called the Corsi-Rosenthal Box can be made from a box fan, air filters, and duct tape.
- The box costs $70–$120, lasts a school year, and can clean air at 600 cubic feet per minute.
- Many schools lack proper ventilation systems, and there are no national standards for indoor air quality.
- The pandemic has increased awareness of indoor air quality issues in schools.